-static ir_node *prepare_constr_insn(be_chordal_env_t *env, ir_node *irn)
-{
- const arch_env_t *aenv = env->birg->main_env->arch_env;
- bitset_t *def_constr = bitset_alloca(env->cls->n_regs);
- bitset_t *tmp = bitset_alloca(env->cls->n_regs);
- ir_node *bl = get_nodes_block(irn);
- be_lv_t *lv = env->birg->lv;
-
- be_insn_t *insn;
- int i, j;
-
- for (i = get_irn_arity(irn) - 1; i >= 0; --i) {
- ir_node *op = get_irn_n(irn, i);
-
- const arch_register_t *reg;
- arch_register_req_t req;
-
- if (arch_get_irn_reg_class(aenv, irn, i) == env->cls) {
- reg = arch_get_irn_register(aenv, op);
-
- if (reg && arch_register_type_is(reg, ignore)) {
- arch_get_register_req(aenv, &req, irn, i);
-
- if (arch_register_req_is(&req, limited)) {
- bitset_clear_all(tmp);
- req.limited(req.limited_env, tmp);
-
- if (! bitset_is_set(tmp, reg->index)) {
- ir_node *copy = be_new_Copy(env->cls, env->irg, bl, op);
- be_stat_ev("constr_copy", 1);
-
- sched_add_before(irn, copy);
- set_irn_n(irn, i, copy);
- DBG((env->dbg, LEVEL_3, "inserting ignore arg copy %+F for %+F pos %d\n", copy, irn, i));
- }
- }
- }
- }
- }
-
- insn = chordal_scan_insn(env, irn);
-
- if(!insn->has_constraints)
- goto end;
-
- /* insert copies for nodes that occur constrained more than once. */
- for(i = insn->use_start; i < insn->n_ops; ++i) {
- be_operand_t *op = &insn->ops[i];
-
- if(op->has_constraints) {
- for(j = i + 1; j < insn->n_ops; ++j) {
- be_operand_t *a_op = &insn->ops[j];
-
- if(a_op->carrier == op->carrier && a_op->has_constraints) {
- ir_node *copy = be_new_Copy(env->cls, env->irg, bl, op->carrier);
- be_stat_ev("constr_copy", 1);
-
- sched_add_before(insn->irn, copy);
- set_irn_n(insn->irn, a_op->pos, copy);
- DBG((env->dbg, LEVEL_3, "inserting multiple constr copy %+F for %+F pos %d\n", copy, insn->irn, a_op->pos));
- }
- }
- }
- }
-
- /* collect all registers occuring in out constraints. */
- for(i = 0; i < insn->use_start; ++i) {
- be_operand_t *op = &insn->ops[i];
- if(op->has_constraints)
- bitset_or(def_constr, op->regs);
- }
-
- /*
- insert copies for all constrained arguments living through the node
- and being constrained to a register which also occurs in out constraints.
- */
- for(i = insn->use_start; i < insn->n_ops; ++i) {
- be_operand_t *op = &insn->ops[i];
-
- bitset_copy(tmp, op->regs);
- bitset_and(tmp, def_constr);
-
- /*
- Check, if
- 1) the operand is constrained.
- 2) lives through the node.
- 3) is constrained to a register occuring in out constraints.
- */
- if(op->has_constraints && values_interfere(lv, insn->irn, op->carrier) && bitset_popcnt(tmp) > 0) {
- /*
- only create the copy if the operand is no copy.
- this is necessary since the assure constraints phase inserts
- Copies and Keeps for operands which must be different from the results.
- Additional copies here would destroy this.
- */
- if(!be_is_Copy(op->carrier)) {
- ir_node *copy = be_new_Copy(env->cls, env->irg, bl, op->carrier);
-
- sched_add_before(insn->irn, copy);
- set_irn_n(insn->irn, op->pos, copy);
- DBG((env->dbg, LEVEL_3, "inserting constr copy %+F for %+F pos %d\n", copy, insn->irn, op->pos));
- be_liveness_update(lv, op->carrier);
- }
- }
- }
-
-end:
- obstack_free(&env->obst, insn);
- return insn->next_insn;
-}
-
-static void pre_spill_prepare_constr_walker(ir_node *bl, void *data)
-{
- be_chordal_env_t *env = data;
- ir_node *irn;
- for(irn = sched_first(bl); !sched_is_end(irn);) {
- irn = prepare_constr_insn(env, irn);
- }
-}
-
-void be_pre_spill_prepare_constr(be_chordal_env_t *cenv) {
- irg_block_walk_graph(cenv->irg, pre_spill_prepare_constr_walker, NULL, (void *) cenv);
-}
-